21308039570 has 16 divisors (see below), whose sum is σ = 38365990848. Its totient is φ = 8520655920.

The previous prime is 21308039563. The next prime is 21308039587. The reversal of 21308039570 is 7593080312.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284846 + ... + 351785.

It is an arithmetic number, because the mean of its divisors is an integer number (2397874428).

Almost surely, 2^21308039570 is an apocalyptic number.

21308039570 is a deficient number, since it is larger than the sum of its proper divisors (17057951278).

21308039570 is a wasteful number, since it uses less digits than its factorization.

21308039570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639985.

The product of its (nonzero) digits is 45360, while the sum is 38.

The spelling of 21308039570 in words is "twenty-one billion, three hundred eight million, thirty-nine thousand, five hundred seventy".